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Preparation of nano graphite carbon colloidal SOL by pulse electrode process

A nano-graphite and carbon sol technology, applied in the electrolysis process, electrolysis components and other directions, can solve the problems of low efficiency of graphite sol, inability to obtain graphite sol, etc., and achieve good surface modification effect, no industrial pollution, and good dispersibility.

Inactive Publication Date: 2005-02-16
华农纳米科技(天津)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The inventor of the present invention found after repeating the method of CN1378975A that the efficiency of preparing graphite sol by this method is relatively low. Generally speaking, it takes 20 days or even longer to obtain graphite carbon sol with a sol concentration of about 0.5%.
Also, nano-sized graphite sols cannot be obtained when using higher currents and voltages in this method

Method used

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  • Preparation of nano graphite carbon colloidal SOL by pulse electrode process
  • Preparation of nano graphite carbon colloidal SOL by pulse electrode process
  • Preparation of nano graphite carbon colloidal SOL by pulse electrode process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Get 4 high-purity graphite carbon plates (200mm × 200mm × 50mm, Jilin Carbon Group Shanghai Carbon Plant) as anode 11, 4 stainless steel plates (200mm × 200mm × 2mm, commercially available) as cathode 12, 7 polyethylene Mesh plate (thickness 1mm, mesh diameter 10mm, commercially available) 16, according to Figure 4 To form a system, the anode 11, the polyethylene mesh plate 16 and the cathode 12 are repeatedly arranged without intervals. The pulse power supply 15 generates as figure 2 For the pulse voltage shown, the pulse period is 0.05 seconds, and the effective voltage is 5V.

[0040] Add sulfuric acid to deionized water to adjust its pH to 2.5, add sodium chloride to adjust the resistance of the solution, so that when the effective value of the pulse voltage is 5V, the current of the system is 10A.

[0041] Apply pulse voltage for 10 days to obtain graphite carbon sol A, the sol concentration is about 2% (weight).

[0042] The obtained graphite carbon sol A was...

Embodiment 2

[0044] Take 4 high-purity graphite carbon plates (200mm×200mm×50mm) as anodes 11, 4 graphite carbon plates (200mm×200mm×30mm) as cathodes 12, and 7 polyethylene mesh plates (thickness 1mm, mesh diameter 10mm) )16, according to Figure 4 To form a system, the anode 11, the polyethylene mesh plate 16 and the cathode 12 are repeatedly arranged without intervals. The pulse power supply 15 generates as figure 2 For the pulse voltage shown, the pulse period is 0.5 seconds, and the effective voltage is 3V.

[0045] Add sodium hydroxide to deionized water to adjust its pH to 8, add sodium chloride to adjust the resistance of the solution, so that when the effective value of the pulse voltage is 3V, the current of the system is 8A.

[0046] Apply pulse voltage for 15 days to obtain graphitic carbon sol B, the sol concentration is about 1.5% (weight).

[0047] The obtained graphite carbon sol B was stored for several months without precipitation or delamination.

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Abstract

The invention discloses a method to produce nanometer graphite sol. It supplies a system which includes highly pure graphite as anode, inert materials as cathode and electrolytical aqueous solution. There is an impulsing power source to connect the anode and cathode. The pulse period of the power source is 0.05-0.5 second, effective voltage 2-10V (3-5V is prelatered) and effective amphere density 15-75A (25-35 is prelatered). The efficiency of this invention is higher than common direct-current electrode method. The produced nanometer graphite sol is stable and disperses so it can produce nanometer graphite powder whose diameter is under 15nm.

Description

technical field [0001] The invention relates to a method for preparing nanometer materials, in particular to a method for preparing nanographite carbon sol by an electrode method. Background technique [0002] Nanomaterials refer to materials that have at least one dimension in the range of nanoscale (0.1nm-100nm) in the spatial dimensions of the components that make up the material. Nanomaterials have a large specific surface area due to their extremely small spatial dimensions and extremely high surface energy. The special properties that ordinary size materials do not have have attracted extensive attention from the scientific and technological circles. The preparation and application technology of nanomaterials has become a new content of material research in the 21st century. [0003] A large number of studies have shown that when carbon is in the nanoscale range, it has many special properties that conventional size carbon materials do not have. It is widely used in e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C25B1/00
Inventor 刘键
Owner 华农纳米科技(天津)有限公司
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